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Why is the cold inflation pressure 40/28 psig, f/r.
The recomended cold tire pressure is 33 psig/29 psig, f/r' which is 4 psi different. I can see running 5-6 psi difference, but not 12 psi.
Since the rear tires are slightly under inflated they will heat up more than the fronts for the same mileage.
Tires are elastomeric. They flex, change shape, expand and contract. The only way I can see that you can approximate hot diameters is to rig up some sort of very large calipers and measure the horiz. outside diameter (OD) of the tires acrross the center of the tire when cold and then when hot. I don't think that you can approximate meaningful expansion data from pressures, because the sidewalls bulge when hot. Good Luck.
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